Magpul® MBUS Back Up Front Sight, Gen 2

(23 reviews)
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Magpul MBUS Back Up Front Sight, Gen 2

The new MBUS (Magpul Back-Up Sight) GEN 2 is a low-cost, color injection molded, folding back-up sight. The MBUS Front Sight is adjustable for elevation and fits all MIL-STD-1913 Picatinny rail equipped weapons, but is specifically tailored to the AR15/M16/M4 platform.

Made in the U.S.A.


  • Impact resistant polymer construction provides light weight and resists operational abuse
  • Spring-loaded flip up sight easily activated from either side or by pressing the top
  • Detent and spring pressure keeps sight erect but allows for unobstructed folding under impact, etc.
  • Clamps to most any MIL-STD-1913 Picatinny/STANAG 4694 railed hand guard and provides the same height-over-bore as standard A2 irons
  • Protective wings shield the spring-locking A2 front sight post

• Weight, w/ hardware: 1.2 oz.
• Height above rail, stowed: ~0.51 in.
• Length, stowed: 2.6 in.
• Length, deployed: 1.5 in.

NEW Features for GEN 2
• Reduced size for greater optics compatibility
• Spring-locking front sight post holds consistent elevation

NOTE: Cannot be mounted to a railed gas block due to excess heat issues. Front MBUS must be mounted to a railed fore end on the same plane as the receiver rail. Because of this the sight is not compatible with the MOE Hand Guard.


  • 5
    Best gear

    Posted by John Montes on 30th Dec 2019

    Every one knows that Magpul mbus sights are the best polymers you can find and to top that off SKD has the best deals and fastest shipping I’ve seen. This is a score if I’ve ever seen one.

  • 5
    What you need is here

    Posted by Rocky Hernandez on 3rd Apr 2015

    Can't say enough, best backup sights for the money. Got them in OD for my IWI Tavor, Also have them in FDE for my Stag Arms AR15-2T 🇺🇸

  • 5
    Product: Magpul MBUS Back Up Front Sight, Gen 2

    Posted by Jorge Méndez on 25th Aug 2014

    Good price outstanding delivery time

  • 4
    Back up sights

    Posted by Adam Moseley on 3rd Aug 2014

    Quality piece of essential equipment. Great shopping and prompt order shipping.

  • 5
    Awesome sights

    Posted by David Keller on 30th Jul 2014

    These worked really well, easy to install & easy to zero. Good as back up sights if my EoTech goes out.

  • 4
    good enough

    Posted by Unknown on 25th Jun 2014

    A little bulkier than Troy's or similar iron sights but also half the pice. Gets the job done.

  • 5

    Posted by Billy Mitchell jr on 2nd May 2014

    Great value and always there when you need them

  • 5
    Great as primary or secondary irons on a budget

    Posted by Unknown on 14th Apr 2014

    So you have a shiny new rifle. Now you need sights. That EOTech is great until the batteries die. Backup sights are a must. These are great. Plastic. Made in the USA. And spring operated. When I put them on my rifle and shot it for the first time I didn't even need to adjust elevation or windage. Your mileage may vary. SKD shipped fast and cheap. Thank you Magpul and thank you SKD.

  • 5
    Good back up sights

    Posted by Jason on 9th Jan 2013

    Does what it's supposed to do.... These sights are backup "irons" for my AR, mounted with an Aimpoint micro. They are just shy of co-witnessing with the Aimpoint, but that wasn't their intended purpose, so it doesn't bother me at all. If the Aimpoint goes down in a fight, it'll be removed (that's why it's mounted with a QD mount). I haven't done much high volume shooting with it on, so I don't know exactly how it'll hold up once the barrel gets really hot. It's mounted on a Spikes 12" BAR quad rail. This thing has a very large diameter, and milled out quite a bit, so it's never really gotten hot; I don't anticipate any issues with the front sight being plastic. I haven't really abused this rifle, so can't speak to how rugged this plastic sight is (yet). Honestly, if this was my Oh Sh!t rifle, I would have real metal irons mounted. All in all, good back up sights for the price.